using System.Collections.Generic;
using GeometryTD.CustomEvent;
using GeometryTD.DataTable;
using UnityGameFramework.Runtime;

namespace GeometryTD.CustomComponent
{
    public partial class CombatScheduler
    {
        private sealed class CombatRunningPhaseState : CombatStateBase
        {
            private readonly DRLevelPhase _phase;
            private readonly IReadOnlyList<DRLevelSpawnEntry> _spawnEntries;

            public CombatRunningPhaseState(
                CombatScheduler scheduler,
                DRLevelPhase phase,
                IReadOnlyList<DRLevelSpawnEntry> spawnEntries) : base(scheduler)
            {
                _phase = phase;
                _spawnEntries = spawnEntries;
            }

            public override void OnEnter()
            {
                Scheduler._enemyManager.BeginPhase(_phase, _spawnEntries);
                GameEntry.Event.Fire(
                    Scheduler,
                    CombatProcessEventArgs.Create(
                        Scheduler._phaseLoopRuntime.DisplayPhaseIndex,
                        Scheduler._phaseLoopRuntime.PhaseCount));
                GameEntry.Event.Fire(
                    Scheduler,
                    CombatEnemyHpRateChangedEventArgs.Create(
                        ResolveEnemyHpRateMultiplier(
                            Scheduler._phaseLoopRuntime.DisplayPhaseIndex,
                            Scheduler._phaseLoopRuntime.PhaseCount)));

                if (!Scheduler._nodeEnterFired)
                {
                    Scheduler._nodeEnterFired = true;
                    GameEntry.Event.Fire(Scheduler, NodeEnterEventArgs.Create());
                }

                Log.Info(
                    "CombatScheduler phase started. Level={0}, Phase={1}, EndType={2}, Entries={3}.",
                    Scheduler._currentLevel != null ? Scheduler._currentLevel.Id : 0,
                    Scheduler._phaseLoopRuntime.DisplayPhaseIndex,
                    _phase.EndType,
                    _spawnEntries != null ? _spawnEntries.Count : 0);
            }

            public override void OnUpdate(float elapseSeconds, float realElapseSeconds)
            {
                if (Scheduler._phaseLoopRuntime.CurrentPhase == null)
                {
                    Scheduler.EnterFailureFallback("CombatScheduler update failed. Current phase is null.");
                    return;
                }

                Scheduler._phaseLoopRuntime.AdvancePhaseElapsed(elapseSeconds);
                Scheduler._enemyManager.OnUpdate(elapseSeconds, realElapseSeconds);

                if (Scheduler.ShouldEnterSettlementFromActiveState(out string reason, out bool isVictory))
                {
                    Scheduler.ChangeState(new CombatSettlementState(Scheduler, reason, isVictory));
                    return;
                }

                if (Scheduler._enemyManager.IsPhaseSpawnCompleted)
                {
                    Scheduler.EnterWaitingForPhaseEnd();
                }
            }
        }
    }
}